66645534 has 8 divisors (see below), whose sum is σ = 133291080. Its totient is φ = 22215176.

The previous prime is 66645517. The next prime is 66645583. The reversal of 66645534 is 43554666.

It is a sphenic number, since it is the product of 3 distinct primes.

66645534 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 66645492 and 66645501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5553789 + ... + 5553800.

It is an arithmetic number, because the mean of its divisors is an integer number (16661385).

Almost surely, 2^66645534 is an apocalyptic number.

66645534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66645534 is a wasteful number, since it uses less digits than its factorization.

66645534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11107594.

The product of its digits is 259200, while the sum is 39.

The square root of 66645534 is about 8163.6716004504. The cubic root of 66645534 is about 405.4372841279.

The spelling of 66645534 in words is "sixty-six million, six hundred forty-five thousand, five hundred thirty-four".